The recording industry has tapped into two Internet file-swapping services and is flashing messages to music traders warning them they're breaking the law.

"COPYRIGHT INFRINGEMENT WARNING," the message reads. "When you break the law, you risk legal penalties. There is a simple way to avoid that risk: DON'T STEAL MUSIC."

At the same time, the industry is collecting the user names of people suspected of illegally offering copyright material with the file-sharing services Kazaa and Grokster, but it doesn't intend to pursue legal action, said Recording Industry Association of America President Cary Sherman.

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